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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd288d3f27012e88282a7303000967f7f6100d8d98764fae7faf0e094af253708' 
  AND token = '1n/UD2amxaV60ZVQOfo09+mdonxDIO4rZq0xBw8OIrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}